Which method is more accurate? Explain your answer. 20.00mL of heavy water (D20

Question

Which method is more accurate? Explain your answer. 20.00mL of heavy water (D20 where D is a hydrogen with a neutron in its nucleus) at 20 degreeree C was pipette into a 32.234 g beaker. The total mass of the beaker and water was 60.859 g. What is the density of the heavy water at 20 degreeree C? The density of ethylene glycol is greater than water. The density of water is 1 g/mL If the density of a water mixture is greater than the density of pure water, the other components within the water mixture must have a higher density than water. Is the density of the mixture an average of the densities of each component? Explain your answer. 25.00 mL of radiator liquid (water and ethylene glycol) has a mass of 25.6025 g. Calculate its density. Given the accompanying table of mass percent and freezing temperature versus density from the Handbook of Chemistry and Physics," determine the mass percent of radiator liquid. %A(first column) is % by mass; D420 (second column) is density and the degreeree C is the difference in the freezing point between the mixture and the freezing point of water. (This is subtracted from 0 degree C) What is the mass percent of the antifreeze mixture? What is the freezing point of the mixture?

Explanation / Answer

2) density = mass/ volume = (60.589-32.234)/20 = 1.41775 g/mL 3)No density is not average ..it is calculated in proportion in which constituents of mixture are present. 4) 1.0241 g/mL

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